Cheetah 15K.5 FC Product Manual, Rev. F
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3.3 Performance
• Programmable multi-segmentable cache buffer
• 800 Mbytes/sec maximum instantaneous data transfers per port
• 15k RPM spindle; average latency = 2.0 msec
• Command queuing of up to 128 commands
• Background processing of queue
• Supports start and stop commands (spindle stops spinning)
• Adaptive seek velocity; improved seek performance
3.4 Reliability
• Annualized Failure Rate (AFR) of 0.62%
• Increased LSI circuitry inte gration
• Self-Monitoring Analysis and Reporting Technology (S.M.A.R.T.)
• Dithering
• 5-year warranty
3.5 Formatted capacities
Standard OEM models are formatted to 512 b ytes per block. The sector size is selectable at format time. Users
having the necessary equipment may modify the data block size before issuing a format command and obtain
different formatted capacities than those listed.
To provide a stable target capacity environment and at the same time provide users with flexibility if they
choose, Seagate recommends product planning in one of two modes:
1. Seagate designs specify capacity points at certain sector sizes that Sea gate gu ara ntees cur rent and futu re
products will meet. We recommend customers use this capacity in their project planning, as it ensures a
stable operating point with backward and forward compatibility from generation to generation. The current
guaranteed operating points for this product are:
2. Seagate drives also may be used at the maximum available capacity at a given sector size, but the excess
capacity above the guaranteed level will vary between 10K an d 15K fam ilie s and fr om g ener ation to gener -
ation, depending on how each sector size actually formats out for zone frequencies and splits over servo
bursts. This added capacity potential may range from 0.1 to 1.3 percent above the guaranteed capacities
listed above. Using the drives in this manner gives the absolute maximum capacity potential, but the user
must determine if the extra capacity potential is useful, or whether their assurance of backward and for-
ward compatibility takes precedence.
3.5.1 Programmable drive capacity
Using the Mode Select command, the drive can change its capacity to something less than maximum. See the
Mode Select Parameter List table in the SCSI Commands Reference Manual . Refer to the Param eter list block
descriptor number of blocks field. A value of zero in the number of blocks field indicates that the drive shall not
Sector Size
ST3300655FC ST3146855FC ST373455FC
Decimal Hex Decimal Hex Decimal Hex
512 585,937,500 22ECB25C 286,749,488 11177330 143,374,744 88BB998
520 573,653,847 22314357 280,790,184 10BC84A8 140,395,092 85E4254
524 566,007,800 21BC97F8 275,154,368 106685C0 137,577,184 83342E0
528 557,874,778 21407E5A 272,662,935 10408197 136,331,467 82040CB